JPS6049842B2 - engine water temperature gauge - Google Patents

Description

[Detailed description of the invention] The present invention relates to an engine water temperature gauge.

In general, engine cooling water temperature must be controlled with a water temperature gauge while the engine is running to prevent it from boiling within the cooling system. As shown by curve I in FIG. 1, the boiling point of water shifts toward higher temperatures as the pressure increases. (Curve I: Relationship between boiling point of water and pressure) Also, the cooling capacity of the radiator increases as the difference between water temperature and air temperature increases, so by increasing the internal pressure of the cooling system, the boiling point increases and the cooling capacity improves. The method is commonly used.

(The pressure in the cooling system is increased by providing a pressure valve in the radiator.) However, there may be a malfunction of the pressure valve or a leak in the system, so it cannot be said that the boiling point is always high.

Therefore, in order to improve reliability, the operator must constantly control both the pressure and water temperature inside the cooling system. Conventionally, there are the following two cases for the above reasons.

1.Managed with only a water temperature gauge...The increased pressure only serves as a safety factor, and the benefit of the increased pressure is halved.

2.Management with two water temperature gauges and pressure gauges...difficult for the driver to judge.

The present invention has been made in view of the above-mentioned circumstances, and its object is to integrate a water temperature gauge and a pressure gauge into one, so that the dangerous water temperature range can be changed depending on the pressure, and the driver can To provide a convenient engine water temperature gauge that allows you to see both the internal pressure and water temperature of the cooling system at a glance.

Hereinafter, the present invention will be explained with reference to the drawings.

3 in the drawing is a scale plate, and the upper part of the scale plate 3 has a window a formed therein. In addition, a back member 3' is provided on the back side of the scale plate 3.
is attached, the back member 3' covers the window part a from the back, and the back member 3' is colored green. 4 in the drawing is a support shaft, and the support shaft 4 has a first axis exposed on the surface of the scale plate 3.
Pointer 1 is attached.

This first pointer 1 constitutes a temperature indicating section D. Also, the support shaft J
4 is rotatably provided with a second pointer 2. Second guideline 2
A display section is provided at the tip of the pressure indicating section C. The display part is located between the scale plate 3 and the back member 3' and is colored red, and is located in the window part a.
5 It's becoming more visible. The support shaft 4 is connected to a temperature indicating actuation mechanism A.

This temperature indication operation mechanism A is equipped with a pressure introduction part 14 fixed to the water temperature gauge housing 21, and the outlet side of this pressure introduction part 14 is connected to the link 7 via a Bourdon tube 13 with a pin 12. , the link 7 is connected to a lever 5 fixed to the support shaft 4 by a pin 6.

A connecting pipe 15 of a heat sensitive section 16 is connected to the inlet side of the pressure introducing section 14 . A volatile liquid 17 is placed inside the heat sensitive section 16 . This heat sensitive section 16 is provided near the highest temperature region of the engine cooling water. The second pointer 2 is linked to a pressure indicating actuation mechanism B.

This pressure indication operation mechanism B includes a pressure introduction section 20 provided in the water temperature gauge housing 21, and this pressure introduction section 20
The outlet side of the pin 1 is connected to the link 11 via the Bourdon tube 19.
8, and the link 11 connects with the pin 10 and the second pointer 2.
It is connected to the lower end of. The inlet side of the pressure introducing section 20 is connected to an air reservoir in the radiator through a connecting pipe.

Therefore, the Bourdon tube 13 is displaced due to the saturated vapor pressure of the volatile liquid 17, and this displacement causes the link 7, lever 5,
The first pointer 1 is displaced via the support shaft 4.

Since the saturated vapor pressure of the volatile liquid 17 is as shown in FIG. 6, the displacement of the first pointer 1 with respect to the curve (2) (limit water temperature) in FIG. 1 becomes almost a straight line as shown in the curve (2) in FIG. In addition, the Bourdon tube 19 is displaced due to the internal pressure of the radiator, and the position link 11
The second pointer 2 is displaced via.

The limit temperature of the cooling water can be determined with some margin from the boiling point (curve 1), for example, as shown in curve 2 in FIG. 1, taking into account variations in atmospheric pressure, differences in water quality, etc. Therefore,
If the dimensions of the Bourdon tube 19 and the link 11 are designed so that the displacement due to the pressure j at the left end of the display section b of the pointer 2 becomes the straight line ■ in FIG. 1, a very accurate water temperature limit will always be indicated. In addition, as mentioned above, although the steam pressure thermometer is used for the temperature indication operation mechanism A, the present invention is not limited to this, and a steam pressure three thermometer (using a diaphragm), a thermocouple thermometer (using a bellows), or a thermocouple thermometer may be used. Further, although a Bourdon tube pressure gauge is used as the pressure indicating mechanism B, a diaphragm pressure gauge or a bellows pressure gauge may be used. 7 and 8 show another embodiment of the present invention, in which the pressure indicator C is a scale plate itself with a safety range S and a danger range T written on it, and the scale plate 3 is
A shaft pin 10 is installed in the shaft pin 10, and a pressure indicating actuation mechanism B is connected to the shaft pin 10, and the other configurations are the same as those of the above-mentioned embodiment.

Note that 9 is a support shaft member and 8 is a bearing member.

The present invention has been described in detail above, and includes a temperature indicating section D connected to the support shaft 4, and a temperature indicating section D connected to the support shaft 4, and a temperature indicating section D connected to the support shaft 4, and a temperature indicating section D connected to the support shaft 4, and a temperature indicating section D connected to the support shaft 4, and a temperature indicating section D connected to the supporting shaft 4, and a temperature indicating section D connected to the support shaft 4, and a temperature indicating section D connected to the support shaft 4, and a temperature indicating section D connected to the support shaft 4. a temperature indicator operation mechanism A that operates the temperature indicator D; a pressure indicator C that is rotatably provided on the support shaft 4 and has a safe area S and a dangerous area T written thereon; and a pressure indicator C that operates the temperature indicator D according to the internal pressure of the radiator. Since the water temperature gauge and pressure gauge are integrated into one and the dangerous water temperature range can be changed depending on the pressure, the operator can monitor both the cooling system internal pressure and water temperature. This is convenient because it is obvious at a glance.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the relationship between radiator internal pressure and temperature, Fig. 2 is a front view of the display section of the engine water temperature gauge according to an embodiment of the present invention, and Fig. 3 is a cross section taken along line ■1■ in Fig. 2. 4 is an explanatory diagram of the configuration of the temperature indicating mechanism, FIG. 5 is an explanatory diagram of the configuration of the pressure indication mechanism, FIG. 6 is an explanatory diagram of the saturated water vapor pressure of ethyl ether, and FIG. 7 is another embodiment of the present invention. FIG. 8, which is a front view of the display section of the example engine water temperature gauge, is a sectional view taken along the line ■--■ in FIG. 4 is a support shaft, A is a temperature indicator operating mechanism, B is a pressure indicator operating mechanism, C is a pressure indicator, and D is a temperature indicator.

Claims (1)

[Claims] 1. A temperature indicator D connected to the support shaft 4; a temperature indicator operating mechanism A that operates the temperature indicator D according to the cooling water temperature;
A safety area S and a danger area T are rotatably provided on the support shaft 4.
An engine water temperature gauge characterized by comprising a pressure indicator C in which is written, and a pressure indicator operating mechanism B that operates the pressure indicator C according to the internal pressure of the radiator.